I believe Kia OEM cross bars for the Carnival (in the US) are made by Yakima. Yakima also sells cross bars with towers that are different than the OEM. They recommend the jet-stream 60inch with Timberline towers. If you search this forum you will find recommendation for cheaper cross bars by less known brands that people installed that they bought on Amazon or ebay and are happy with (some complain that they are a bit noisy). I haven't bought cross bars yet so don't have any experience to share.Has anyone put up roof rails and a rack on theirs? We want to get a Thule or Yakima box for a long road trip. Anyone know what will work for cross bars? Once you have those, Any box would work.